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Cognomen Cassis (Cassia , Cassis , Kasiso ) , all around the world, is quite a common last name. The family name Cassis is characteristic of Malta, where it is quite a common surname, Bolivia, where it is quite a rare surname, and Haiti. Measured by absolute frequency, the name is most common in Brazil, Italy, and the United States. More frequently, Cassis is the forename as well as the last name.